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Old 02-11-2012, 06:19 PM   #1
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Default Help! Brewing, need preboil SG adjustment for post-boil

I came in at 1.030 preboil in 7g of water. I need to know what this works out to post-boil (60m. boil).

Have first-wort that wouldn't fit in BK and need to know if I need to add it (it's much richer than the second runnings.)


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Open log Fermenting and gas-can secondary?? I am planning my next brew right now!!
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Old 02-11-2012, 06:38 PM   #2
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nevermind. finally found formula. 1.030 at 7g would be 1.037 at finished volume of 5.69.

V1*C1 = V2*C2

so (V1*C1)/V2=C2


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Open log Fermenting and gas-can secondary?? I am planning my next brew right now!!
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Old 02-11-2012, 06:49 PM   #3
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Make sure you temperature-corrected, and cool the sample to under 100 degrees before applying the temperature correction!
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Old 02-11-2012, 07:22 PM   #4
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I put a glass of sample in the freezer until it was sub 80, then tested again nearer to room temp. I'm still coming out low. Boiling more off now.
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Old 02-11-2012, 07:42 PM   #5
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I have a semi-related concern. I've got a weizenbock on the boil now. My sample just cooled to around 74* and my pre-boil reading was 1.032? Beersmith tells me it should be 1.061! I collected 8 gallons from mash for a 90 minute boil. I collected two sets of runninigs and mixed them. Could the two runnings not have been mixed well enough when I took my sample?
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Old 02-11-2012, 07:44 PM   #6
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I found this link on here, http://www.ahomebrewlog.com/gravity_adjustment/
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Old 02-11-2012, 08:02 PM   #7
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Originally Posted by Blackhawkbrew View Post
I have a semi-related concern. I've got a weizenbock on the boil now. My sample just cooled to around 74* and my pre-boil reading was 1.032? Beersmith tells me it should be 1.061! I collected 8 gallons from mash for a 90 minute boil. I collected two sets of runninigs and mixed them. Could the two runnings not have been mixed well enough when I took my sample?
I always stir the crap out of my wort before drawing a sample. Did you plug in the formula above to see what that 32 would come out with your post-boil volume?
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Old 02-11-2012, 08:12 PM   #8
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I usually collect all runnings into my brew kettle and have never had a pre-boil gravity THAT off. I think I'll wait until I get my post-boil gravity reading before I go into full panic mode.

That formula site is handy though! Thanks enkamania!
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Old 02-11-2012, 08:29 PM   #9
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mine was a result of less grain absorption than anticipated. I am doing a BIAB mash and dunk sparge, so I got half the grain absorption. Adjusting this as well as looking for another kettle so I can finish the mash tun into a sparge vessel.
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Old 02-11-2012, 09:44 PM   #10
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So my post-boil ended up at 1.043!? I don't understand what happened! I used beersmith. I'll have to check everything again. The calculator indicated that I need like 4.25 pounds of DME to reach my prescribed OG. I don't have that much DME on hand. Is my batch ok until I get the DME? I didn't pitch my starter yet. And how much water do I use?

This has been my worst brew day EVER (numbers wise).

Help please!!!


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